SQL Self Join

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SQL Self Join

A self join is a regular join, but the table is joined with itself.

Syntax

SELECT column_name(s)
FROM table1 T1, table1 T2
WHERE condition;

T1 and T2 are different table aliases for the same table.

SQL Self Join Example

The following SQL statement matches customers that are from the same city:

SELECT A.CustomerName AS CustomerName1, B.CustomerName AS CustomerName2, A.City
FROM Customers A, Customers B
WHERE A.CustomerID <> B.CustomerID and A.City = B.City ORDER BY A.City;

 

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